package joboo4;

public class job02 {
    public static void main(String[] args) {
        StringBuilder builder1=new StringBuilder();
        StringBuilder builder2=new StringBuilder();

        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        String str2=builder3.toString();

        String a="好好学习java";
        StringBuilder builder=new StringBuilder(a);

        builder.append(",为了找个好工作");
        System.out.println(builder);

        builder.replace(9,16,"为了改变世界");
        System.out.println(builder);

        builder.delete(0,8);
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);

    }
}
